/*
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.samples.apps.topeka.widget.fab

import android.content.Context
import com.google.android.material.floatingactionbutton.FloatingActionButton
import android.util.AttributeSet
import android.view.View
import android.widget.Checkable

import com.google.samples.apps.topeka.quiz.R

/**
 * A [FloatingActionButton] that implements [Checkable] to allow display of different
 * icons in it's states.
 */
class CheckableFab(
		context: Context,
		attrs: AttributeSet? = null
) : FloatingActionButton(context, attrs), Checkable {

	private var _checked = true

	private val attrs = intArrayOf(android.R.attr.state_checked)

	init {
		setImageResource(R.drawable.answer_quiz_fab)
	}

	override fun onCreateDrawableState(extraSpace: Int): IntArray {
		val drawableState = super.onCreateDrawableState(1 + extraSpace)
		if (_checked) {
			View.mergeDrawableStates(drawableState, attrs)
		}
		return drawableState
	}

	override fun setChecked(checked: Boolean) {
		if (_checked == checked) return
		_checked = checked
		refreshDrawableState()
	}

	override fun isChecked() = _checked

	override fun toggle() {
		_checked = !_checked
	}

}
